Ami lecofltre piquet



(No Model.) 2 Sheets-Sheet l. A. L. PIQUET'.

STOP WATCH.

No. 394,933. Patented Dec. 18, 1888.

2 Sheets-Sheet 2.

(No Model.)

A. L. PIQUBT.

STOP WATCH.

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UNITED STATES PATENT EErcE.

AMI LECOULTRE PIQLTET, OF BRASSUS, ASSIGXOR T() AGASSlZ FILS, 0F ST. DIIER, SVITZERLAND.

STOP-WATCH.

SPECIFICATION forming part of Letters Patent No. 394,933, dated December 18, 1888. Application tiled October 19, 1886. Serial No. 216,641. (No model.)

T0 @ZZ 107mm it may concern:

Be it known that l, AMI LECOLLTRE PIQUET, ot' Brassus, Switzerland, have invented eertain new and useful Improvements in (.hronograph-llvatches, ot which the following is a specification. Y

The object of my invention is to provide a new and improved stop-watch of simple construction which operates rapidly and accurately.

T he invention consists mainly in a stopwatch having the wheel that engages with the stop-watch wheel and drives the stop-watch mechanism from the main works mounted on an oscillating shaft rjournaled in a fixed bridge l and a shifting-lever.

The invention further consists in the novel construction of the mechanism for holding and locking the split-seconds mechanism, and

in the arrangement of the stop-watch mechanism on the upper and lower surfaces of the three-quarter plate; and the invention also consists in the construction and combination of parts and details, as will be fully described and set forth hereinafter, and then pointed out in the claims.

ln the accompanying' drawings, Figure l is a back view of my improved stop-watch, parts being shown in dotted lines and others omitted entirely and others broken out. Fig. 2 is a cross-section on the line c 5c' @c2 at, Fig. l. Fig. 3 is a detail cross-section on the lines ly y', Fig. l. Fig. 4f is a detail cross-sectional view on the line u 7u', Fig. l.

Similar letters of reference indicate corresponding parts.

The wheel a, having three hundred teeth, is mounted rigidly on the tubular shaft or arbor A' some distance below the upper end, which arbor is passed through the works, and on the other end of said tubular shaft or arbor A' the fly-back hand A2 is mounted, which can rotate over the dial l. With the wheel A the i toothed wheel B, having thirty teeth, can be engaged, said wheel B being mounted on the l upper end of the oscillating shaft B9, on the lower end of which the cog-wheel B', having fourteen teeth, is mounted, said wheel B engaging with the fourth wheel, C, of the usual watch-works. On the arbor C' of the wheel C, the usual small seconds-hand, C2, is mounted, which revolves over the small dial usually l provided on the large dial l. The oscillating shaft or arbor 'B2 is mounted at its lower end to revolve and to rock, swing, or oscillate in the short bridge N, fastened by means of a screw on the upper surface of the main plate of the works, and acted upon by the spring X2, and the upper end of the said oscillating shaft ll2 is mounted to oscillate and at the same time to revolve in one end of the lever L, which is pivoted on the upper surface of the three-quarter plate L to swing' parallel to the same. The wheel A and the toothed wheel B are moupted in recesses of three-(niarter plate L'.

rl`he bridge N can he adjusted in position by means of the screw resting against one edge ot said bridge and serving to press the bridge in the opposite direction of that in which it is pressed by the spring X2, and the pivoted lever L can be adjusted by means of the screw M, screwed into the three-quarter plate L', and serving to limit the throw of said lever L.

Against that end of the lever L, opposite the one in which the shaft of the arbor is mounted, one end of the lever R rests, which is pivoted on the upper surface of the threequarter plate to swing parallel with the saine, the other end of said lever R resting against the rim of the toothed or star wheel F, which is iixed on the hub E' of the ratchet-wheel E, mounted to rotate on the under side of the three-quarter plate L', parallel with the plane y of the same, the hub E' of said wheel E passing through an aperture of the three-quarter plate, so that the toothed or star wheel F is l upon the upper surface of said three-quarter plate L'. The wheel F has sixY teeth and the wheel E eighteen.

The hook-pawl P', pivoted on one end of the lever P, engages with the teeth of the ratchet-wheel E, the opposite end of the lever P forming an eye through which the windingi stem and push-pin P2 of the works can pass, so that the lever P can be operated by pushing the crown inward; but, if desired, the end of the lever P can be made independent of the winding-stem. A spring, P3, acting on the lever P, presses the end carrying the hookpawl P' inward-that is, toward the center of the works.

The ratchet-wheel. F. prevented from ro- IOO tating in the reverse direction by the locking` pawl-spring Q, which can be adjusted by the screw Q'.

The spring L2, fastened on the top of the three-quarter plate, rests against the lever L, between the pivot of the lever and the end in which the oscillating shaft P2 is mounted, and presses that end of the lever L carrying the oscillating shaft toward the wheel A. A heart-cam, D, is mounted rigidly on the tubular shaft or arbor A' directly above the stopwlieel A.

A lever, G, is pivoted on the top of the upper surface of the three-quarter plate, one end of which lever is pressed against the edge of the heart-cam D by a spring, G', fastened on the upper surface of the three-quarter plate and acting on said lever G, said spring also pressing a projection, G2, of the lever G against the rim of the toothed or star wheel F. The lever H is pivoted on the upper surface of the three-quarter plate near the wheel A, and is provided at one end with a downwardly-projecting pin, H', which can engage with the toothed rim of the wheel A. The other end of the lever H is pressed against the rim of the toothed or star wheel F by a spring, H2, fastened on the top of the three-quarter plate and resting against the lever H, between the pivot and the downwardly-projecting pin H', so that the said spring also serves for pressing the pin H' against the rim of the wheel A.

The above construction applies to stopwatches having a single fly-back hand. In case a split-seconds hand, J', is provided, the same is mounted on a shaft or arbor, J, passed longitudinally through the tubular arbor or shaft A', and is jonrnaled in a separate bridge, as shown in Fig. 2, carries at its npper end the toothed wheel S, having two hundred and forty teeth, which wheel S is of less diameter than the wheel A. Said wheel S is provided with a pivoted arm, U', carrying a roller rest-ing against the rim of a heart-cam, T, mounted rigidly on the upper end of the tubular shaft or arbor A', which arm U' is connected by a link, V, with a spring, V2, fastened on one end of the spokes of the wheel S, said spring serving to press the roller on the end of the arm U' against the heartcani T.

On the upper surface of the three-quarter plate two spring-levers, U, are pivoted adjacent to each other, the inner edges of the end parts of which are toothed and are adjacent to the rim of the toothed wheelS. At diametrically-opposite points between said springarms a flat cam piece or finger, X', projects upward from the shaft X2, mounted to turn in the main plate N', which shaft X2 carries a four-pointed star-wheel, X, directly above the main plate, which wheel X can be rotated by an angular lever, Z, pivoted at Z' and acted upon by a spring, Z2. One end of the leverZ projects beyond the edge of the werks to permit operating it.

Y is a pawl engaged with a four-toothed wheel, X, for preventing the reverse movement of the same, and VY' is a spring pressing the pawl l' against said wheel X.

Two spring-rods, d, are fastened at their lower ends in a plate, 7l, Fig. 2, and said spring-rods pass up through suitable apertures in the plates of the works and into apertures m of the two levers U and serve to Apress said levers toward each other and their toothed ends toward the ri 1n of the wheel S.

It will be observed that the elements of all the parts of the stop mechanism are fastened on the three-quarter plate, the most of them on the upper surface of said plate, thus facilitating the attaching of said stop mechanism without interfering with the other parts of the works.

The operation is as follows: By pressing inward that end of the lever P at the windingstein the pawl P' rotates the ratchet-wheel E the distance of one tooth in a direction from right to left, thus causing one of the teeth of the star-wheel F to act on the projection G2 of the lever G, whereby the swinging end of said lever is removed from the heart-cam D on the tubular shaft A', whereby the wheel A is released at the same time that the end of the lever R, resting on the rim of the, starwheel F, drops into one of the recesses or notches of the said wheel and permits the spring L2, which acts on the lever L, to throw that end of the lever L carrying the shaft B2 toward the wheel A, whereby the wheel B is engaged with the teeth of the wheel A. As the wheel B' on the shaft B2 is being continuously revolved from the fourth wheel, C, of the watch-works, the wheel A begins to Arevolve as soon as the wheel B' is engaged with it. The stop-watch mechanism is now in operation, and the hand A2 is revolved over the dial. lVhen this motion is to be stopped, that. end of the lever P at the winding-stem is pushed inward, whereby the ratchet-wheel E is again revolved the distance of one tooth and the wheel F is moved correspondingly. One end of the lever H slides off the riin of the wheel F into one of the notches, whereby the downwardly-projecting pin H' is brought in contact with the rim of the wheel A,whieh is thus stopped immediately. At the same time the rim of one of the projections of the wheel F acts on the lever R, the other end of which lever acts on that end of the lever L opposite the one carrying the shaft B2,where by said shaft is swung from the rim of the wheel A and the wheel B is disengaged from the wheel A. Then the hand A2 is to be brought back to twelve, the lever P is again pushed inward, whereby the ratchet-wheel E is moved the distance of one tooth and the wheel F is rotated accordingly, whereby one of the teeth of the wheel F acts on the lever H and moves the pin H' from the wheel A, which is thus released, and at the same time the projection G2 of the lever G arrives at one of the notches vor recesses of the wheel F, into which it drops under the action of the spring IOO IIO

G, whereby the swinging end ot the lever G is pressed against the heart-cam, and, acting on the rim of the same, throws said heart-cam around until the end ot said lever G rests in the notch ot the cam, whereby the hand A is brought back to twelve.

The above operation relates to a watch having only one .tty-back hand. X'Vhen the wheel S is released, it is carried around by the heartcam T as the roller on the end ot the a-rm lT et' the wheel S is held in the notch ot' said heart-cam T, which heart-cam is fixed on the tubular shat't or arbor A. Yhen the wheel S is locked in place, such movement cannot take place. 'hen it is desired to revolve the split-seconds hand J', the outwardly-proj ecting end ot the lever Z is pressed inward, so as to revolve the wheel X from right to lett, whereby the cam or finger X is brought in the position shown in Fig. l and forces the levers li U trom each other, th ns releasing the wheel t5. The split-seconds hand J is now revolved with the hand A2. lYhen it is desired to stop the split-seconds hand J', the projecting' end ot' the lever Z is again pushed inward, whereby the star-wheel X again turned one-quarter, and the linger or cam X is brought into a position parallel to the line drawn midway between the levers lv, thus permitting the springs d to press the ends ot' the levers against the rim of the wheel S, which is thus locked in place. The heart-cam T continues to rotate, but cannot carry along the wheel \\'hen the lever Z is again pushed inward, the levers vU li are separated and the wheel S travels around the heart-cam until the end ot the arm ll" rests in the notch of said heart-cam T, whereby the hand .l is brought to the same position as the hand A?.

llaving thus describet'l my invention, l claim as new and desire to secure by Letters Patentl. A stop-watch constructed with an oscillating' shat't or arbor so mounted thatone end i only swings, said shatt or arbor carrying two wheels, ot' which the one on the upper or swinging end is capable ot engaging with the stop-watch wheel A, and the other at or near the lower end ot' the shal't opposite the one that swings is permanently engaged wit-h one of the wheels ot the works, substantially as shown and described.

L. A stop-watch having the wheel l'or engagement with the stopwatch wheel A mounted on an oscillating shat't or arbor, one end ot' which is journaled in an adjustable bridge and the other in a movable lever, substantially as shown and described.

Si. ln a stop-watch, the combination, with the usual watch-works, ot' an oscillating sha tt or arbor mounted in a bridge and a pivoted lever, a toothed wheel on said arbor tor engagement with the stop-watch wheel A, acogwheel on said shat't engaged with a cog-wheel otl the works, and a lever acted upon by a starwheel and acting upon the pivoted lever in which one end ot' the oscillating arbor is mounted, substantially as shown and described.

t. In a stop-watch, the etnnbination, with the stop-watch wheel A, ot' an oscillating' shaft mounted lin a bridge and in a pivoted lever, mechanism tor shit't'in the pivoted lcver, and a wheel on the oscillating shaft, which wheel can be engaged with the stopwatch wheel, substantially as shown and described.

In a stop-watch, the combination, with the stop-watch wheelA, ot' a star-wheel, mechanism t'or rotating the star-wheel, a lockinglever t'or the stop-watch wheel operated by the star-wheel, a heart-cam connected with the stop-watch wheel, a lever operated bythe star-wheel and acting on the heart-cam, an oscillating shat'tY mounted on-a bridge and a pivoted lever, a wheel on the oscillating' shal't, which wheel can engage Vthe stop-watch wheel, a cog-wheel on the oscillating shal't engaged with one ot' the wheels o t' the works, and a lever operated by the star-wheel and acting on the pivoted lever, in which one end olf the oscillating shatt is mounted, substantially as shown and described.

(i. ln a stopwatch, the combination ot' an oscillating shaft earryinga wheel engaged with a wheel ot' the works and a wheel for engagement with the stop-watch Awheel A, a pivoted lever, in which one end ot.' the oscillating shaft is mounted, and a check or adjusting screw at one side ot' the said pivoted lever, substantially as shown and described.

7. ln a stop-watch, the combination ot' a bridge, a screw acting on the bridge, a spring serving to press the bridge against the screw, a pivoted lever, an oscillating' shaft mounted to revolve in the bridge and pivoted lever, a wheel on the oscillating shat't `tor engaging with one ot the wheels ot the watcli-works, and a wheel on the other end ol the shai't for engaging with the stop-watch wheel, substantially as shown and' described.

S. In a stop-watch, the combination, with the toothed wheel, ot' two pivoted levers, one at each side ol' the same, two spring-rods fastened in a suitable plate and projecting upward and through said levers and pressing them toward each other, and a cam-piece for pressing the levers t'rom each other, substantiallv as shown and described.

ttfln a stop-watch, the combination, with a toothed wheel. ot' two swing-levers, one pivoted at each side. ot' the wheel. springs fastened below the Vlevers and protecting upward and acting on said levers, and a cam tor sepa- 5 rating the levers, substantially as shown and described.

ln testimolrv that l claim the foregoing as my invention lhave signed my name in presence oi two subscribing witnesses.

AMI LEVUVL'IRR PlQlliT. \\'itnesses:

LvELL T. ADAns, PAUL Munoz. 

